Malicious PDF — malware analysis report

Static analysis result for SHA-256 545a1e7f0df98e01…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 17:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1de6d0b5ea262348386f3668bd20289b SHA-1: 860b788d51a549d5dab0cf203bd839d7a8f487a2 SHA-256: 545a1e7f0df98e010e68be3a2012f21acbea36c66fc2d2ca4d71576018ba5faf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly supports this attack pattern. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution vector, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=get+latest+android+version PDF link annotation
    • http://gsmontaggi.it/userfiles/files/mefepibuwip.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6702070ae---31110095384.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1e2487da0---piwilamuvewudaradojunova.pdfIn PDF document text
    • https://fultoys.com/userfiles/bevaluguvudazifoboxaleg.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/tunagudubugilawexebed.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130202f22419---joxipuxebemawunuvuleda.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/waxovalumubugep.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109030632498507.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614090e293dfc---kowebaruko.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/73157689684.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/lonotevupo.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ap9stotiqthtra9mie96dbi823/6349675001.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/38911845680.pdfIn PDF document text
    • http://haki.vn/uploads/files/39069685966.pdfIn PDF document text
    • http://only-svet.ru/upload/files/77960699819.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wulogemitag.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/52266108889.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/52579574309.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/gapaxususukofowonejaw.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/52060624876.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/mononibenufixerinis.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/85931364560.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/98738857195.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 17536 bytes
SHA-256: ae6c24d4d20494ce7f27f006f2b941702e6280216e901a9e7f0c89f25ab2dbb9
font_01_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DD 10348 bytes
SHA-256: c4068ff65d3ad39d3bb7f086965078c3b5b8c6570a58267c9f82d2b5056d9f51

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